Revolving suction-strainer



J. W. E. ELLING.

REVOLVING SUCTION STRAINER.

APPLICATION FILED MAR. 3, 1921.

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Application filed March 3, 1921.

To all whom it may concern:

Be it known that l, JnNs WILLIAM EcrnIUs'lELLINc, a subject of the Kingof Norway, residing at Christiania, Norway, have invented certain newand useful Improvemen-ts in Revolving Suction-Strainers; and I do herebydeclare the following to be a full, clear, and exact description of the1nvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

This invention has for its object a revolving suction strainer suitablefor use in mechanical and chemical wood 4 pulp mills, paper factories aswell as in other industries.

An important feature of the present strainer as compared with knowntypes of revolving suction strainers consists therein that the portionof the strainer which above the level of the liquid in which thestrainer revolves is kept covered by an endless belt of a tightmaterialwhich prevents air from being sucked into t e interior of the strainerat this portion of the strainer surface.

lln addition to this feature the strainer is suitably so arranged thatthe substantial portion of the working surface of the strainer ismaintained above the level of the liquid. 1

An embodiment of this invention is illustraited in the accompanyingdrawing in which Figure 1 is a transverse sectional view of thestrainer.

Fig. 2 is a longitudinal sectional view of nions of the drum aresituated above the j edge of the vat 5 so that only a minor part of thestrainer surface 1 is immerged in the liquid. An endless belt of oiledcanvas (hospital canvas) or other-water tight material passes overrollers 6, 7, 8 and rests with its lower run upon the top portion of theI strainer. In addition to the endless beltof watertight material anendless belt of'felt may be arranged upon which the pulp is talren upfrom the strainer surface. in this:

Specification of Letters Patent.

Patented May filth, 1199211..

Serial No. =9, l97.

result in squeezing water out of the pulp layer between the belt and thestrainer surface. T he water will flow through openings 9 in the wall ofthe drum and into the sucti on chamber 11 partitioned in the drum by atransverse wall 10, and from the chamber 11 the water is sucked outthrough the suction pipe 13 with downwardly directed orifice 12. Thepipe 13 extends through the hollow trunnion 3 of the drum, and a studingbox. This pipe does not rotate with the drum. To prevent air from beingsucked in at that portion of the strainer surface, which is situatedbetween the roller 6 and the level of the liquid a slide 14 is arranged,which is pressed against the wall of the suction chamber by means of aspring 15. The slide is hinged to a stationary'bar 16 con: nected to thepipe 13.

The apparatus may be employed in connection with any kindof suspensionsfrom which it is desired to remove the suspended particles.

ll claim 1. A suction strainer comprising a revolving strainer drum withits straining surface arranged to be partially erged in liquid andnon-straining means over a substantial portion of the straining surfacenot immerged.

2. A suction strainer comprising a revolving drum with its strainingsurface partially immersed in liquid and an endless belt of d. A suctionstrainer according to claim 1, meansto preventair from being sucked intothe interior of the strainer drum through such portions at the strainersurtill lltl) face which are not covered by the tight belt nor coatedwith pulp.

5. A suction strainer according to claim 1 means to prevent air frombeing sucked into the interior of the strainer drum through suchportions at the strainer surface which are not covered by the tight beltnor coated with pulp, said means comprising a slide mounted in theinterior of the drum.

6. A suction strainer comprising a revolving strainer drum with itsstraining surface arranged to be partially immerged in liquid,

Let/7,765

a non-straining means covering a substantial exterior portion or thedrum and means within the drum to prevent straining action of saidsurface between the surface of the liquid and the first mentioned means.

In testimony that I claim the foregoing as my invention, 1 have signedmy name in presence of two subscribing witnesses.

. JENS WELLIAM IEGIDHUS Ell-1N6, Witnesses: 1 MAGAN BRIGGE, GULBORGGULBRANDSEN.

